ShowInEditor attribute revert value to default

[Deleted user]

Problem: When I change BallSpeed value to 100 in editor, press enter and click start simulation. Value back to 30

My code:

using System;
using System.Collections.Generic;
using FlaxEngine;

namespace Pong
{
	public class ActorBall : Script
	{
        [ShowInEditor] private float BallSpeed = 30f;
        private RigidBody rigidBody;

        private void Awake()
        {
            rigidBody = this.Actor as RigidBody;
        }
        private void FixedUpdate()
        {
            rigidBody.LinearVelocity = Vector3.Right * BallSpeed;
        }
}
}

[Wojciech Figat]

That's because private fields are not serialized by default.
To fix it just add Serialize attribute to the BallSpeed field like that:

[ShowInEditor, Serialize] private float BallSpeed = 30f;

See serialization rules listed in a documentation here: https://docs.flaxengine.com/manual/scripting/serialization/index.html

[Deleted user]

Maybe attribute ShowInEditor should be serialized by default?

[Wojciech Figat]

I'm not sure because it could be also used to debug private fields just to show them in properties panel without saving.

[Deleted user]

Attribute like this will be better for debug https://answers.unity.com/questions/489942/how-to-make-a-readonly-property-in-inspector.html